The diesel engine in my m1008 is missing a bunch of parts and the tranny/tcase are all busted up from a broken driveshaft, so I'm going to throw in the gas 350/th350/np203 combo out of my other truck. Biggest worry I have is the braking system. Obviously i'd like to keep the hydroboost brakes, but it's a huge can of worms. I'm doing hydro assist, so I'd have to run two pumps, one for the hydroboost and one for the steering. The hydroboost pump on the diesel won't just go right over, I'll have to swap brackets, and then make brackets for my regular steering pump. I think it might be easier to swap over to vacuum boosted brakes. I of course have the old truck to scrounge parts from. I've read that I need the vacuum can itself, the pedal, and the actuator rod out of the old truck. Do I need to switch master cylinders as well? old truck has a 3/4 ton master in it, 1008 has the stock 1 ton master. Are vacuum and hydroboost master cylinders different for the same size truck?